*{
    margin: 0;
    padding: 0;
}
ul,li {
    list-style: none;
}
a {
    text-decoration: none;
}
.footer {
    width: 100%;
    height: 100px;
    background: #3d3d3d;
    text-align: center;
    line-height: 21px;
    color: #ffffff;
    padding-top: 20px;
    font-size: 12px;
    padding: 20px auto;
    }
    @media only screen and (min-width: 1200px) {
       .footer .marign {
           width: 1200px;
           margin: auto;
       } 
    }
    @media only screen and (max-width: 1200px) {
        .footer .marign {
           width: 100%;
           margin: auto;
       } 
    }